How does this work compared to the duals? When is there a need for duals? I have a single bilstein on my truck w slightly bigger tires while I have duals on the X and don't notice any difference.
the reason for using dual opposition is that the larger high pressure dampers have enough rebound force to actually steer the vehicle if you only used 1, by opposing them it cancels that out since they push against each other.
The fox thru shaft allows you to use the large high pressure style "shock" but due to the design of the pass thru shaft it has equal force on compression and rebound so no need for duals.
When is there a need for duals ? When the OEM small one isn't cutting it. Depends on how and where you drive and the other mods you make but generally speaking 37"+ tires